How can I replace and solder 1000pF SMD capacitors in a synth repair, and is it okay to use a higher-voltage replacement part?
You can solder the SMD capacitors with practice, and a 50V 1000pF replacement is fine in place of a 10V part because using a higher voltage rating is acceptable [#21662191][#21662200] Use lots of flux, a very fine solder tip, and a magnifier; if the parts are very small, practice first and buy extras in case you ruin one [#21662191] One reply also recommends a hot-air blower to start with, and another says the “flood and suck” approach with solder wick can work well on SMD pins [#21662193][#21662197] The cap bank was described as small 1005/very small SMD parts, so careful technique matters most [#21662194][#21662199]
AI summary based on the discussion. May contain errors.
Fixing a digital synth and ran into a cap bank that has been blown. First their all SMD caps second they are all 1000pF caps. I don't have experience with soldering SMD packages and couldnt find 1000pF caps in any other packaging...any suggestions or tips would be great...
Hi Nickolas, You shouldn't have too much problems soldering an SMD part. I do it all the time in work. It takes a little practice.
How small are the 1000pF caps? if they're an 0805 package, you should be ok, if they're smaller than that, I'd suggest maybe practicing soldering them down or buying twice the amount of caps you need, just in case you make a mess of it. I'd really recommend using a flux pen and use lots of it, it eases the flow of the solder and leaves a nice clean connection as well.
Good question but they do go short circuit now and again very seldom I must admit but like all good things "Cough cough cough " Bad health you know They do In answer to this mans question though on a more serious note You need a very fine solder tip , magnifying glass , soldering flux and if you can afford one a hot air blower to start with
Nice cheap budget to start with " Highly recommended "
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I believe that they are 1005 caps. I was definitely going to get a few extra and just so how things go...I've don't through hole and copper roofing as the extent of soldering! Thanks for the link, this will help.
I've measured all the components in the synth and have found only these to be malfunctioning. Apparently the musician was having a little too much fun one evening and spilled all over the keys, power on, but didn;t notice until the next morning...unfortunate...
Mark- Thanks so much for the links and information, I've been having a hard time finding leaded solder, which even i know is much easier to work with. I will definitely give these companies a look and hopefully find the things that im looking for. Good to know, since as of right now, my soldering iron is shot, and i was looking for a new and improved one... thanks again
Just use lots of flux.I solder Quad Flat 64 pin ICs in PCB.I put lots of flux on pins,then solder it with a big tip solder tool(figure out small tip doesn't work that well sometime!) . I used flood and suck method......put lots of solder iron over SMD pins and then use solder wick to suck extra residues....... fininshed product looks good n works pretty fine
Hi, If you are finding any problem in SMD Soldering . then you can use service of any PCB assembler which provide service for proto or low volume like *Bittele*
Im still a little scared of the SMD parts, it's a 1.6mm X .3mm cap, and there are 9 of them within a 3/4 inch linear area, the specific caps are 1000pF, 10V(strange i know), it is used in the synth to prevent backflow through a ribbon cable to the keys....do you think it would be okay if i used a 1000pF, 50V instead? I've always heard bigger is better, but no the other way around, but mostly in relation to fuses, not caps... Thanks so much for your help!
in regard to cap voltages, you are correct, you can always replace lesser with greater. these are the maximum design limits, put over 20V on a 20V cap and it might blow out so replacing a 20V cap with a 50V cap is just fine, just dont do it the other way around
The discussion addresses soldering 1000pF surface-mount device (SMD) capacitors, specifically in 0805 or 1005 packages, during digital synthesizer repair. Key advice includes practicing soldering due to the small size of components (approximately 1.6mm x 0.3mm), using ample flux to improve solder flow and joint quality, and employing fine soldering tips or hot air rework tools for precision. It is recommended to purchase extra capacitors to account for potential handling errors. The use of leaded solder is preferred for ease of work, though unleaded options are available. For voltage ratings, replacing a 10V capacitor with a higher voltage rating such as 50V is acceptable and safe. Some users suggest professional PCB assembly services like Bittele for low-volume prototyping or difficult soldering tasks. Additional tips include the flood and wick method for soldering IC pins and the importance of magnification tools. The original fault was caused by liquid damage leading to shorted capacitors in the synth’s key interface circuitry. AI summary based on the discussion. May contain errors.
